Grease gun connecting nozzle

ABSTRACT

A grease gun connecting nozzle comprises an injector pipe. A support sleeve inserts inside the injector pipe. A front end of the injector pipe is locked to the structure element to be greased via a connecting element. Four movable leaves are mounted around the outer peripheral sidewall of the support sleeve. A pipe plunger made of plastics material inserts inside the support sleeve to prevent its deformation. The pipe plunger comprises a front pipe and a rear pipe with an outer radius larger than that of the front pipe. The rear pipe inserts inside the injector pipe. The front end of the pipe plunger is inwardly recessed in the shape of a bell that engages with a conical head of the connecting element. The leaves tighten a neck at a rear portion of the connecting element. Thereby, grease leakage is effectively prevented, and a rapid assembly can be achieved.

FIELD OF THE INVENTION

[0001] The invention relates to a grease gun connecting nozzle for lubricating a structure element and, more particularly, to a gun nozzle that prevents grease leakage.

BACKGROUND OF THE INVENTION

[0002] Referring to FIG. 1, a conventional grease gun structure comprises a grease supply pipe 1 that is connected to a hollow connecting head 3 via a manifold 2. A front end of the connecting head 3 is crewed with an injector pipe 4 that, in turn, is locked by screwing to a sputter gun A.

[0003] The sputter gun A comprises a pipe-shaped main body B having a rear end connected to an opening of the front end of the injector pipe 4. The main body B inwardly receives a spring C, and via a valve D connects to a front end of the spring C. The valve D has a front opening occluded by a ball E. An axial rod F abuts against the ball E. When the trigger stem G of the sputter gun A is pressed, the rod F therefore presses against the ball E, which pushes backward the valve D that compresses the spring C. Thereby, via an adequate pressure, the grease inside the pipe 1 is supplied through the manifold 2 and penetrates the injector pipe 4 to reach the inner pipe of the main body B. Because the ball E receives the supply pressure, it may also move forward. As a result, the grease passes via the opening of the valve D to the connecting nozzle at the front end of the sputter gun A. Then, via the outlet of the connecting nozzle of the sputter gun A, the grease is injected on the tool or element to be greased. However, the connecting portion of the connecting nozzle of the sputter gun A may be easily subject to undesirable grease leakage.

SUMMARY OF THE INVENTION

[0004] Accordingly, it is therefore a principal object of the invention to provide a grease gun connecting nozzle in which a pipe plunger made of rubber inserts inside a support sleeve of the injector pipe. As a result, rapid assembly can be favorably achieved and grease leakage is effectively prevented.

[0005] To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The drawings included herein provide a further understanding of the invention. A brief introduction of the drawings is as follows:

[0007]FIG. 1 is a sectional view of a grease gun of the prior art.

[0008]FIG. 2 is a sectional view of a grease gun connecting nozzle according to an embodiment of the invention.

[0009]FIG. 3 is an exploded view of a grease gun connecting nozzle according to an embodiment of the invention.

[0010]FIG. 4A and FIG. 4B are sectional views illustrating the operation of the grease gun connecting nozzle according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] Wherever possible in the following description, like reference numerals will refer to like elements and parts unless otherwise illustrated.

[0012] Referring to FIG. 2 and FIG. 3, a grease gun connecting nozzle of the invention comprises an injector pipe 10 made of metal. A front opening of the injector pipe 10 is reduced by an abutting edge 11 having an inner diameter smaller than that of the injector pipe 10. A hollow support sleeve 12 made of metal inserts inside the injector pipe 10. The support sleeve 12 terminates in a larger rear flange 121. Four movable leaves 14 are mounted around the outer peripheral sidewall of the support sleeve 12, and abut against the rear flange 121. A pipe plunger 13 made of plastics material inserts inside the interior 122 of the support sleeve 12. The pipe plunger 13 comprises a front pipe 131 and a rear pipe 132. The front pipe 131 has an outer radius smaller than that of the rear pipe 132 and can be thereby inserted through the support sleeve 12. Meanwhile, the rear pipe 132 abuts against the rear flange 121. The pipe plunger 13 is centrally provided with a conical hole 133 that contracts from the rear end to the front end. A recessed flank 134 is formed through the rear side of the conical hole 133 to receive the mount of a first end of a spring 135. The other end of the spring 135 is connected to a steel ball 136. The front end surface of the pipe plunger 13 is inwardly recessed in the shape of a bell 137. A tubular connecting head 15 is screwed with the rear end of the injector pipe 10. A front hole 151 of the connecting head 15 is smaller than a rear hole 152 of the same connecting head 15. The difference of diameter between the front and rear holes 151, 152 forms an abutment flange 153. The rear side of the connecting head 15 is locked onto the oil outlet pipe H of the sputter gun A.

[0013] A connecting element 20, having a threaded portion 21, is locked to the piece of tool that is to be greased. Another portion of the connecting element 20 is formed in a conical head 22 that engages with the bell 137 of the pipe plunger 13. A rear side of the conical head 22 is formed in a contracted neck 23, which enables the grease inside the conical hole 133 of the pipe plunger 13 to penetrate a central hole 24 of the connecting element 20. Furthermore, front edges of the leaves 14 at the outer peripheral sidewall of the support sleeve 12 tighten on the neck 23 of the connecting element 20. The injector pipe 10 has to reversely rotate 360 degrees to assemble with the connecting element 20.

[0014] With the above structure, when the trigger stem G is pressed, the grease formed in a half solid state (lubricant) is delivered through the connecting pipe 3 into the interior of the main body B, as illustrated in FIG. 2. When the ball E is squeezed, the grease penetrates inside the oil outlet pipe H of the sputter gun A.

[0015] Referring to FIG. 4A and FIG. 4B, when the steel ball 136 receives the compressive force from the spring 135, the grease penetrates the front hole 151 of the connecting head 15 and reaches the interior of the conical hole 133 of the pipe plunger 13. Through the bell 137, the grease then penetrates the central hole 24 of the connecting element 20 to lubricate the tool.

[0016] Being inserted in the injector pipe 10, the rear pipe 132 of the pipe plunger 13 prevents leakage of the grease through the leaves 14 around the peripheral sidewall of the injector pipe 10. Furthermore, by an adequate length of insertion, the pipe plunger 13 protects the support sleeve 12 from deformation due to the grease circulation. Via the selective occlusion of the central hole 24 through the conical head 22 by the bell 137, outer leakage of the grease is therefore eliminated. The rubber material of the pipe plunger 13 allows a hermetic sealing between the bell 137 and the conical head 22 and prevents grease leakage.

[0017] Furthermore, the rear pipe 132 of the pipe plunger 13 has a diameter that is identical to that of the rear portion of the injector pipe 10, which further prevents the formation of leakage gaps there between.

[0018] It should be apparent to those skilled in the art that the above description is only illustrative of specific embodiments and examples of the invention. The invention should therefore cover various modifications and variations made to the herein-described structure and operations of the invention, provided they fall within the scope of the invention as defined in the following appended claims. 

What is claimed is:
 1. A grease gun connecting nozzle, suitable for assembly with a oil outlet terminal end of a sputter gun, the grease gun connecting nozzle comprising: an injector pipe; a connecting head, connecting the injector pipe to the oil outlet of the sputter gun, a front end of the connecting head inwardly receiving a spring and a steel ball, a front hole of the connecting head being smaller than a rear hole of the connecting head to form an abutment flange against which abuts the steel ball; and a metallic support sleeve, internally mounted with a pipe plunger, the pipe plunger comprising front pipe and a rear pipe smaller than the front pipe to form a T-shape, the front pipe of the pipe plunger being inserted inside the sleeve while the rear pipe being inserted inside the injector pipe, a rear end of the pipe plunger being recessed flank to receive a first end of the spring, a front end of the pipe plunger being formed in a bell that engages with a conical head of a connecting element locked to a tool to be greased, the conical head being located at a rear end of the connecting element while a front end of the connecting element terminates in a contracted neck that is tightened via four movable leaves.
 2. The grease gun connecting nozzle of claim 1, wherein the pipe plunger is centrally provided with a conical hole that contracts from a rear side to a front side of the pipe plunger. 